Multi-trait selection of wheat lines under drought-stress condition

IF 1.2 4区农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY

Bragantia Pub Date : 2023-05-22 DOI:10.1590/1678-4499.20220254

C. M. Silva, H. Mezzomo, João Paulo Oliveira Ribeiro, Davi Soares de Freitas, M. Nardino

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Abstract

The immediate need for the increase in wheat production to meet the future world demand, associated with the occurrence of drastic climatic events, such as drought, makes it necessary to develop drought-resilient genotypes. The aims of this work were to evaluate the use of drought-tolerance indices for the selection of wheat genotypes, to compare the genetic gains in grain yield using different selection strategies by means of a multi-trait index, and to select superior drought-tolerant wheat genotypes. The total of 31 tropical wheat lines was evaluated in two experiments. Five agronomic traits were accessed. The grain yield data from the stress and nonstress experiments were used to obtain five drought-tolerance indices. The data were subjected to mixed model analysis, and four selection scenarios were designed. There was a significant effect of genotype for all traits. The inclusion of drought-tolerance indices in the selection index provided superior genetic gains in drought condition. Seven lines were selected due the high frequency of favorable alleles for drought-tolerance and other important agronomic traits. Drought-tolerance indices are appropriate for characterizing the response of wheat genotypes to droughtstress. The inclusion of drought-tolerance indices along with agronomic traits in multi-trait selection strategies provides for superior gains in grain yield compared to the non-inclusion of the indices.

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干旱胁迫条件下小麦品系的多性状选择

由于干旱等极端气候事件的发生，迫切需要增加小麦产量以满足未来世界的需求，因此有必要开发抗旱基因型。本研究的目的是评价抗旱指标在小麦基因型选择中的应用，通过多性状指标比较不同选择策略对籽粒产量的遗传增益，并筛选出抗旱优势小麦基因型。在两个试验中对31个热带小麦品系进行了评价。获取了5个农艺性状。利用胁迫和非胁迫试验的粮食产量数据，得到5个抗旱指标。对数据进行混合模型分析，设计了4种选择方案。基因型对各性状均有显著影响。在选择指标中加入耐旱性指标，在干旱条件下具有优越的遗传增益。由于耐旱性和其他重要农艺性状的有利等位基因频率高，选择了7个品系。耐旱性指标是表征小麦基因型对干旱胁迫反应的适宜指标。在多性状选择策略中纳入抗旱性指标和农艺性状比不纳入抗旱性指标更有利于籽粒产量的提高。

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来源期刊

Bragantia AGRICULTURE, MULTIDISCIPLINARY-

CiteScore

2.40

自引率

8.30%

发文量

审稿时长

4 weeks

期刊介绍： Bragantia é uma revista de ciências agronômicas editada pelo Instituto Agronômico da Agência Paulista de Tecnologia dos Agronegócios, da Secretaria de Agricultura e Abastecimento do Estado de São Paulo, com o objetivo de publicar trabalhos científicos originais que contribuam para o desenvolvimento das ciências agronômicas. A revista é publicada desde 1941, tornando-se semestral em 1984, quadrimestral em 2001 e trimestral em 2005. É filiada à Associação Brasileira de Editores Científicos (ABEC).